I should have handled it much earlier instead of leaving it to deteriorate to how it is now...
Anyway, there are damp patches covering nearly the half of the ceiling on one side. On the other side, the roof board slipped due to the side supporting bar came halfway off on the edge. Now there's a gap in the middle of the ceiling (about a inch) where you could see the sky. 😰
So obviously the felts need to be replaced and the roof board needs to be fixed.
I couldn't find many recommended tradesmen to ask for quote. So far only got one guy who quoted £580 for replacing the roof boards which will be in 12mm osb which will need 4-5 of and replacing the felt with a high grade shed felt with lap seals and adhesives.
DH had a look on the cost of new shed just as a benchmark. It seems to purchase and install a new shed of similar size only costs about £1.2k. Is it fair to compare this cost of £600 for repair a roof with buying a new one?
Shall we better off replace the whole shed or repair it? I think the shed is still in a ok condition in general. But It's been 10 years since we bought the house. So the shed is certainly +10 years old.
We live in London area.